NSC LMS8117AMPX-3.3, LMS8117AMP-ADJ, LMS8117AMP-1.8, LMS8117ADTX-ADJ, LMS8117ADTX-3.3 Datasheet

LMS8117A
1A Low-Dropout Linear Regulator

General Description

The LMS8117Ais a series of low dropout voltage regulators
with a dropout of 1.2V at 1A of load current. It has the same
pin-out as National Semiconductor’s industry standard
LM317.

The LMS8117A is available in an adjustable version, which
can set the output voltage from 1.25V to 13.8V with only two
external resistors. In addition, it is also available in two fixed
voltages, 1.8V and 3.3V.

The LMS8117Aoffers currentlimiting and thermal shutdown.
Its circuit includes a zener trimmed bandgap reference to
assure output voltage accuracy to within

±

1%.

The LMS8117A series is available in SOT-223 and TO-252
D-PAK packages. A minimum of 10µF tantalum capacitor is
required at the output to improve the transient response and
stability.

Features

n Available in 1.8V, 3.3V, and Adjustable Versions
n Space Saving SOT-223 and TO-252 Packages
n Current Limiting and Thermal Protection
n Output Current 1A
n Temperature Range 0˚C to 125˚C
n Line Regulation 0.2% (Max)
n Load Regulation 0.4% (Max)

Applications

n Post Regulator for Switching DC/DC Converter
n High Efficiency Linear Regulators
n Battery Charger
n Battery Powered Instrumentation

Typical Application

Fixed Output Regulator

DS101196-28

July 2001

LMS8117A 1A Low-Dropout Linear Regulator

© 2001 National Semiconductor Corporation DS101196 www.national.com

Ordering Information

Package

Temperature Range

(T

J

)

Packaging Marking Transport Media

NSC

Drawing

0˚C to +125˚C

3-lead
SOT-223

LMS8117AMP-ADJ LS0A 1k Tape and Reel MP04A

LMS8117AMPX-ADJ LS0A 2k Tape and Reel

LMS8117AMP-1.8 LS00 1k Tape and Reel

LMS8117AMPX-1.8 LS00 2k Tape and Reel

LMS8117AMP-3.3 LS01 1k Tape and Reel

LMS8117AMPX-3.3 LS01 2k Tape and Reel

3-lead TO-252 LMS8117ADT-ADJ LMS8117ADT-ADJ Rails TD03B

LMS8117ADTX-ADJ LMS8117ADT-ADJ 2.5k Tape and Reel

LMS8117ADT-1.8 LMS8117ADT-1.8 Rails

LMS8117ADTX-1.8 LMS8117ADT-1.8 2.5k Tape and Reel

LMS8117ADT-3.3 LMS8117ADT-3.3 Rails

LMS8117ADTX-3.3 LMS8117ADT-3.3 2.5k Tape and Reel

Connection Diagrams

SOT-223

DS101196-99

Top View

TO-252

DS101196-38

Top View

LMS8117A

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Block Diagram

DS101196-1

LMS8117A

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Maximum Input Voltage (V

IN

to GND)

LMS8117A-ADJ, LMS8117A-1.8,
LMS8117A-3.3 20V

Power Dissipation (Note 2) Internally Limited
Junction Temperature (T

J

)

(Note 2)

150˚C

Storage Temperature Range -65˚C to 150˚C

Soldering Information

Infrared (20 sec) 235˚C

ESD Tolerance (Note 3) 2000V

Operating Ratings (Note 1)

Input Voltage (V

IN

to GND)

LMS8117A-ADJ, LMS8117A-1.8,
LMS8117A-3.3 15V

Junction Temperature Range
(T

J

)(Note 2)

0˚C to 125˚C

Electrical Characteristics

Typicals and limits appearing in normal type apply for TJ= 25˚C. Limits appearing in Boldface type apply over the entire junc­tion temperature range for operation, 0˚C to 125˚C.

Symbol Parameter Conditions

Min

(Note 5)

Typ

(Note 4)

Max

(Note 5)

Units

V

REF

Reference Voltage LMS8117A-ADJ

I

OUT

= 10mA, VIN-V

OUT

= 2V, TJ= 25˚C

10mA ≤ I

OUT

≤ 1A, 1.4V ≤ VIN-V

OUT

≤

10V

1.238

1.225

1.250

1.250

1.262

1.270

V
V

V

OUT

Output Voltage LMS8117A-1.8

I

OUT

= 10mA, VIN= 3.8V, TJ= 25˚C

0 ≤ I

OUT

≤ 1A, 3.2V ≤ VIN≤ 10V

1.782

1.746

1.800

1.800

1.818

1.854

V
V

LMS8117A-3.3
I

OUT

= 10mA, VIN=5VTJ= 25˚C

0 ≤ I

OUT

≤ 1A, 4.75V ≤ VIN≤ 10V

3.267

3.235

3.300

3.300

3.333

3.365

V
V

∆V

OUT

Line Regulation
(Note 6)

LMS8117A-ADJ
I

OUT

= 10mA, 1.5V ≤ VIN-V

OUT

≤ 13.75V 0.035 0.2 %

LMS8117A-1.8
I

OUT

= 0mA, 3.2V ≤ VIN≤ 10V

1 6 mV

LMS8117A-3.3
I

OUT

= 0mA, 4.75V ≤ VIN≤ 15V 1 6 mV

∆V

OUT

Load Regulation
(Note 6)

LMS8117A-ADJ
V

IN-VOUT

= 3V, 10mA ≤ I

OUT

≤ 1A 0.2 0.4 %

LMS8117A-1.8
V

IN

= 3.2V, 0 ≤ I

OUT

≤ 1A 1 10 mV

LMS8117A-3.3
V

IN

= 4.75V, 0 ≤ I

OUT

≤ 1A 1 10 mV

V

IN-VOUT

Dropout Voltage
(Note 7)

I

OUT

= 100mA 1.1 1.15 V

I

OUT

= 500mA 1.15 1.2 V

I

OUT

= 1A 1.2 1.25 V

I

LIMIT

Current Limit VIN-V

OUT

= 5V, TJ= 25˚C 1.0 1.4 1.9 A

Minimum Load
Current (Note 8)

LMS8117A-ADJ
V

IN

= 15V 1.7 5 mA

Quiescent Current LMS8117A-1.8

V

IN

≤ 15V

5 10 mA

LMS8117A-3.3
V

IN

≤ 15V 5 10 mA

Thermal Regulation T

A

= 25˚C, 30ms Pulse 0.01 0.1 %/W

Ripple Regulation f

RIPPLE

= 120Hz, VIN-V

OUT

=3V

V

RIPPLE

=1V

PP

60 75 dB

Adjust Pin Current 60 120 µA
Adjust Pin Current

Change

10mA ≤ I

OUT

≤ 1A,

1.4V ≤ V

IN-VOUT

≤ 10V 0.2 5 µA

LMS8117A

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Electrical Characteristics (Continued)

Typicals and limits appearing in normal type apply for TJ= 25˚C. Limits appearing in Boldface type apply over the entire junc­tion temperature range for operation, 0˚C to 125˚C.

Symbol Parameter Conditions

Min

(Note 5)

Typ

(Note 4)

Max

(Note 5)

Units

Temperature Stability 0.5 %
Long Term Stability T

A

= 125˚C, 1000Hrs 0.3 %

RMS Output Noise (% of V

OUT

), 10Hz ≤ f ≤ 10kHz 0.003 %

Thermal Resistance
Junction-to-Case

3-Lead SOT-223
3-Lead TO-252

15.0
10

˚C/W
˚C/W

Thermal Resistance
Junction-to-Ambient
(No heat sink;
No air flow)

3-Lead SOT-223
3-Lead TO-252 (Note 9)

136

92

˚C/W
˚C/W

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: The maximum power dissipation is a function of T

J(MAX)

, θJA, and TA. The maximum allowable power dissipation at any ambient temperature is

P

D

=(T

J(MAX)–TA

)/θJA. All numbers apply for packages soldered directly into a PC board.

Note 3: For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF.
Note 4: Typical Values represent the most likely parametric norm.
Note 5: All limits are guaranteed by testing or statistical analysis.
Note 6: Load and line regulation are measured at constant junction room temperature.
Note 7: The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage. It is measured when the

output voltage has dropped 100mV from the nominal value obtained at V

IN=VOUT

+1.5V.

Note 8: The minimum output current required to maintain regulation.
Note 9: Minimum pad size of 0.038in

2

LMS8117A

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